I was walking with purpose (meaning striding firmly and quickly). I reached forward and pressed on the bar of the door to open it to go through...and apparently didn't fully depress it, because a fraction of a second later I slammed face first into the closed door.

In full view of the cafeteria (about 150 people)

I had to turn around, jerk my thumb towards the door, roll my eyes at myself, then give the thumbs up to the people who were half AHAHAHA / half omg is she ok?? before scurrying away.